package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前当前加入到购物车的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);//动态查询
        //如果已经存在，则数量加1
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);//获取第一条购物车数据（如果能查到的话，最多只有一条）
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);//属性赋值后，更新数据库
        }else{
            //如果不存在，则插入一条购物车数据，数量默认为1

            //判断当前添加到购物车的是商品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            Long setmealId = shoppingCartDTO.getSetmealId();
            if(dishId != null){//添加的是菜品
                shoppingCart.setDishFlavor(shoppingCartDTO.getDishFlavor());
                //获取当前菜品名称
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());
            }else{//添加的是套餐
                shoppingCart.setSetmealId(shoppingCartDTO.getSetmealId());
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setImage(setmeal.getImage());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }
    //查看购物车
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();//获取当前用户id
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    //清空购物车
    @Override
    public void cleanShoppingCart() {
        //获取当前用户id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }
    //删除购物车中一个商品
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //获取当前用户id和是dish还是setmeal
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .dishId(shoppingCartDTO.getDishId())
                .setmealId(shoppingCartDTO.getSetmealId())
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        ShoppingCart cart = list.get(0);
        if(list != null && list.size() > 0){
            if (cart.getNumber() == 1){
                shoppingCartMapper.delete(cart);
            }else{
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(cart);
            }
        }
    }
}





















